On Fri, 2 Jan 2009, Tom Lane wrote:
> ISTM that you *should* be able to see an improvement on even
> single-spindle systems, due to better overlapping of CPU and I/O effort.
The earlier synthetic tests I did:
http://archives.postgresql.org/pgsql-hackers/2008-09/msg01401.php
Showed a substantial speedup even in the single spindle case on a couple
of systems, but one didn't really seem to benefit. So we could theorize
that Robert's test system is more like that one. If someone can help out
with making a more formal test case showing this in action, I'll dig into
the details of what's different between that system and the others.
--
* Greg Smith gsmith(at)gregsmith(dot)com http://www.gregsmith.com Baltimore, MD